All my photos are in the "All Photos" album on the phone, and are all visible.

In the past, I would connect my phone to the PC via a cable, and selected the "allow device to access photos".
The photos would be in the DCIM folder.
I could copy them to a backup location - job done...

Now, I try the same:
"allow to access..."
DCIM folder is there, but "the folder is empty"